package com.bootdo.clouddoexam.util;

import com.bootdo.clouddoexam.domain.ScoreDO;
import org.apache.log4j.Logger;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.web.multipart.MultipartFile;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * excel读写工具类 */
public class POIUtil {
    private static Logger logger  = Logger.getLogger(POIUtil.class);
    private final static String xls = "xls";
    private final static String xlsx = "xlsx";

    /**
     * 读入excel文件，解析后返回 
     * @param file
     * @throws IOException
     */
    public static List<String[]> readExcel(MultipartFile file) throws IOException{
        //检查文件  
        checkFile(file);
        //获得Workbook工作薄对象  
        Workbook workbook = getWorkBook(file);
        //创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回  
        List<String[]> list = new ArrayList<String[]>();
        if(workbook != null){
            for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
                //获得当前sheet工作表  
                Sheet sheet = workbook.getSheetAt(sheetNum);
                if(sheet == null){
                    continue;
                }
                //获得当前sheet的开始行  
                int firstRowNum  = sheet.getFirstRowNum();
                //获得当前sheet的结束行  
                int lastRowNum = sheet.getLastRowNum();
                //循环除了第一行的所有行  
                for(int rowNum = firstRowNum;rowNum <= lastRowNum;rowNum++){
                    //获得当前行  
                    Row row = sheet.getRow(rowNum);
                    if(row == null){
                        continue;
                    }
                    //获得当前行的开始列  
                    int firstCellNum = row.getFirstCellNum();
                    //获得当前行的列数  
                    int lastCellNum = row.getPhysicalNumberOfCells();
                    String[] cells = new String[row.getPhysicalNumberOfCells()];
                    //循环当前行  
                    for(int cellNum = firstCellNum; cellNum < lastCellNum;cellNum++){
                        Cell cell = row.getCell(cellNum);
                        cells[cellNum] = getCellValue(cell);
                    }
                    list.add(cells);
                }
            }
            workbook.close();
        }
        return list;
    }
    public static void checkFile(MultipartFile file) throws IOException{
        //判断文件是否存在  
        if(null == file){
            logger.error("文件不存在！");
            throw new FileNotFoundException("文件不存在！");
        }
        //获得文件名  
        String fileName = file.getOriginalFilename();
        //判断文件是否是excel文件  
        if(!fileName.endsWith(xls) && !fileName.endsWith(xlsx)){
            logger.error(fileName + "不是excel文件");
            throw new IOException(fileName + "不是excel文件");
        }
    }
    public static Workbook getWorkBook(MultipartFile file) {
        //获得文件名  
        String fileName = file.getOriginalFilename();
        //创建Workbook工作薄对象，表示整个excel  
        Workbook workbook = null;
        try {
            //获取excel文件的io流  
            InputStream is = file.getInputStream();
            //根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象  
            if(fileName.endsWith(xls)){
                //2003  
                workbook = new HSSFWorkbook(is);
            }else if(fileName.endsWith(xlsx)){
                //2007  
                workbook = new XSSFWorkbook(is);
            }
        } catch (IOException e) {
            logger.info(e.getMessage());
        }
        return workbook;
    }
    public static String getCellValue(Cell cell){
        String cellValue = "";
        if(cell == null){
            return cellValue;
        }
        //把数字当成String来读，避免出现1读成1.0的情况  
        if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
            cell.setCellType(Cell.CELL_TYPE_STRING);
        }
        //判断数据的类型  
        switch (cell.getCellType()){
            case Cell.CELL_TYPE_NUMERIC: //数字  
                cellValue = String.valueOf(cell.getNumericCellValue());
                break;
            case Cell.CELL_TYPE_STRING: //字符串  
                cellValue = String.valueOf(cell.getStringCellValue());
                break;
            case Cell.CELL_TYPE_BOOLEAN: //Boolean  
                cellValue = String.valueOf(cell.getBooleanCellValue());
                break;
            case Cell.CELL_TYPE_FORMULA: //公式  
                cellValue = String.valueOf(cell.getCellFormula());
                break;
            case Cell.CELL_TYPE_BLANK: //空值   
                cellValue = "";
                break;
            case Cell.CELL_TYPE_ERROR: //故障  
                cellValue = "非法字符";
                break;
            default:
                cellValue = "未知类型";
                break;
        }
        return cellValue;
    }

    public static XSSFWorkbook export(List<ScoreDO> list) {
        //定义表头
        String[] excelHeader = {"考生号", "姓名", "班级","语文","数学","英语","物理","化学","生物","政治","历史","地理","总成绩"};
        //这里需要说明一个问题：如果是 Offices 2007以前的Excel版本，new的对象是：**HSSFWorkbook** ，Offices 2007以后的Excel版本new的对象才是XSSFWorkbook
        XSSFWorkbook wb = new XSSFWorkbook();
        //生成一个工作表
        Sheet sheet = wb.createSheet("成绩分析表");
        //生成第一行
        Row row = sheet.createRow((int) 0);
        //生成单元格的样式style
        XSSFCellStyle style = wb.createCellStyle();
        style.setAlignment(CellStyle.ALIGN_CENTER);

        for (int i = 0; i < excelHeader.length; i++) {
            //获取每一个单元格
            Cell cell = row.createCell(i);
            //给单元格赋值
            cell.setCellValue(excelHeader[i]);
            //设置单元格的样式
            cell.setCellStyle(style);
        }

        for (int i = 0; i < list.size(); i++) {
            //得到当前行数的下一行（row.getRowNum()：得到当前行数）
            row = sheet.createRow(row.getRowNum() + 1);
            ScoreDO scoreDO = list.get(i);
            //赋值
            row.createCell(0).setCellValue(scoreDO.getStudentId());
            row.createCell(1).setCellValue(scoreDO.getStudentName());
            row.createCell(2).setCellValue(scoreDO.getStydentGrade());
            row.createCell(3).setCellValue(scoreDO.getChinese()==null?0:scoreDO.getChinese());
            row.createCell(4).setCellValue(scoreDO.getMathematics()==null?0:scoreDO.getMathematics());
            row.createCell(5).setCellValue(scoreDO.getEnglish()==null?0:scoreDO.getEnglish());
            row.createCell(6).setCellValue(scoreDO.getPhysical()==null?0:scoreDO.getPhysical());
            row.createCell(7).setCellValue(scoreDO.getChemistry()==null?0:scoreDO.getChemistry());
            row.createCell(8).setCellValue(scoreDO.getBiology()==null?0:scoreDO.getBiology());
            row.createCell(9).setCellValue(scoreDO.getGovernment()==null?0:scoreDO.getGovernment());
            row.createCell(10).setCellValue(scoreDO.getHistory()==null?0:scoreDO.getHistory());
            row.createCell(11).setCellValue(scoreDO.getGeography()==null?0:scoreDO.getGeography());
            row.createCell(12).setCellValue(scoreDO.getTotal_score()==null?0:scoreDO.getTotal_score());


        }
        return wb;
    }



}